2.9.X Theme to for 2.76b... our lab pc can't run version upper from 2.76b
Here is a 2.8 theme from Blendswap
Here is a 2.8 theme from Blenderartists.org
Please keep in mind that Blender 2.8+ also has a new Collection system (instead of layers) - which can't be changed using a theme.
Good luck :-)